Marcus Gunn pupil
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The pupil dilates instead of constricting when the light moves from the good eye to the bad eye. It is also considered lack of a consensual reflex in the affected eye, showing optic nerve damage in which a sensory of afferent stimulus sent to the brainstem is reduced.
[edit] Source
Bates' Guide to Physical Examination by Lynn S. Bickley 9th Edition Lippincott Williams & Wilkins
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